Nature and all Nature Research journals now require authors to declare any non-financial conflicts of interest:
Competing interests (both financial and non-financial) are defined as a secondary interest that could directly undermine, or be perceived to undermine, the objectivity, integrity and value of a publication through a potential influence on the judgments and actions of authors with regard to objective data presentation, analysis and interpretation. Non-financial competing interests can include a range of personal and/or professional relationships with organizations and individuals, including membership of governmental, non-governmental, advocacy or lobbying organizations, or serving as an expert witness.
Read more: https://www.nature.com/articles/d41586-018-01420-8